Who Mods the Mods

I've got a question that I honestly don't understand, so please don't shut down this thread for "disrespecting or insulting rioters/mods." Who the heck is in charge of moderating the moderators? Is there some sort of hierarchy that keeps mods from doing what ever they like? I'm asking because I've noticed some of the mods are getting heat for shutting down posts or threads for no apparent reason. Also, it seems that the users don't have any say, and are simply left to the mercy of the all powerful moderators. Just asking, let me know if you have any info.
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